Ceph

Earlier version of Cycles.h aborted compilation when the OS/arch was not one of the defined ones. Now it only gives warning and later, once installed, when Cycles::init is called it seems to hang as rdtsc always returns 0.
I solved the problem on Cubieboard by accessing the 32-bit performance counter and implemented following:
#elif defined(ARM_ARCH_7A)
uint32_t r = 0;
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(r) );
return (uint64_t) r;

It would be better if the compilation gets aborted as long as the upper layers are not able to handle this situation properly